Cartridge for mining purposes.



E. & S. PURGBLL.

CARTRIDGE FOR MINING PURPOSES.

APPLIOATION FILED MAR. so, 1908.

91 9,722., Patented Jan. 26, 1909.

-is t UNIT S CARTRIDGE FOR MINING PURPOSES.

Specification of Letters Patent.

Patented Jan. 26', 1909..

Application filed March 80, 1908. Serial No. 424,02l3.

T 0 all whom it may concern.

Be it known that we, EDWARD PURCELL and SAMUEL PURoELL, subjects of the King of Great Britain, and residing at Linden Terrace and The Mount, respectively, both in Pontefract, in the county of York, England, have invented certain new and useful Improvements in Cartridges for Mining Pur- )OSOS, of which the following description, having reference to the accompanying sheet of drawings, .is a specification.

In the employment of cartridges for mining or like purposes such'as for the breaking down of coal, blasting of rock etc., it has been found desirable to dispense with the employment of metal as forming any art of such cartridges. This is done, not on y as a precaution against accidental sparking that might cause premature ignition of the explo- 'sive, but also for purposes of economy, hence cardboard or paper receptacles are extensively made use of. On ilacing cartridges thus constructed, within the holes drilled to receive them considerable difficulty is en-- countered in securing or attaehin the cap or detonator (usually composed of Tulminate of mercury) to the primer or that cartridge which has to be ignited and which has to ignite the other cartridges within such hole, on account of the cardboard or paper casing not being sufficiently rigid to retain same in its proper position. To obviate this disadvantage or defect by the employment of devices which are of com aratively little cost of reduction and whic 1 will act eflicientl e object of our present invention. Tlus object we attain by the devices illustrated in the accompanying sheet of drawings wherein Figure 1 is a longitudinal section of a cartridge with the detonator held in position .therein by the devices hereinafter ex lained.

Fig. 2 is an end elevation of a cartri ge seen in the direction indicated 1) the arrow a of Fig. 1. Figs. 3 and 4 are plan and perspective views respectively of our improved device. Figs. 5 and 6 are sectional and perspective views of the "end of a cartridge show-' mg a modified form of applying our improved parts thereto. Fi 7 is a pers ective view showing a modification hereina ter explained. Fig. 8-is also a perspective view (drawn to a reduced scale) showing the arrangement of certain of the parts hereinafter described. Fig. 9 is a sectional elevation (drawn to a reduced scale) showing how cartrid es are made use of.

Simil ar figures and letters of reference indicate similar parts in all the views. In carrying our invention into efiect we make use of disks of cardboard stout paper or other suitable material I) cut so that radiating projections a will extend from their edges 1n order that they may be bent to an angle thereto, as shown by Fi s. 1, 4 and 5, on or before being inserted within the casing 01' which with the explosive substances e within forms the cartridge. These disks 1) when thus prepared are for insertion within the casing so that the projections ctherefrom will extend ina direction leadin out of the casing d as shown by Figs. 1 a (i 5, in order that when the outer and d of said casin dis turned over to envelo or enfold said disks 6, the projecting parts t ierefrom will be firmly overlapped and locked within, therefore their withdrawal is prevented. In cases where the slight extra expense of providing a flange (as the flange 0 l ig. 7) instead of the tions 0 does not interfere with the use of the disks 6 then such may be formed as shown by having an enlarged opening h for the insertion of the detonator g so that its wires f, f may enter the slot h, or the slot It may extend to the outer edge of the disk I) as above de- -scribed. Or a simple plain disk 1) without projections c or flanges 0 might be made use of. Within each of these disks 1) a central opening I) is made so that the wires f, f (which conduct the electric current to, so as to ignite the cap or detonator g) may pass therethrough, and to enable such wires f, f to be more easily placed within such opening a slot h is made laterally therefrom to extend out of the edge of the disk b so that same may be made to take over the wires and he slid into position. The slot k may either be of the form shown or it may lead in a curved or straight course from the opening I) to the edge of the disk I).

As it is thought desirable that the explosive gases iven off by the primer cartridge (as 7: ig. 9) which is the cartridge fired by the detonator should have as free a course as possible to enable it to act upon the contents of the cartridges m, n (Fig. 9) adjoining; we make openings or perforations 1) through the fixing disks 6 above described so that said gases may have clear passages therethrough.

projec- When it is found'that the disks 1) require still further locking in position, then we may have a groove formed 1n the outer surface of the casmg d to receive a piece of string 1". This strin 1" we firmly tie or fix within this groove an leave two extensions 1", 1" of it to reach across the end of the cartridge as shown by Fig. 6 (or they may be made long enough to extend also around the other end of the casing (1) so as to retain the turned-in ends (1 of the casing d in position. The cap or detonator g is inserted within the casing d by passing it between the strings r, r and in some cases it may be found sufficient to use the string attachments r, r, 1' without makin use of the disk I), While in other cases 7 the dis alone may be sufficient.

end of same, position they are twisted together to cause As means for securing in position the disk b of any of the forms herein efore described, the wires f, f may be bent or turned over the edges of the casingld and carried to the other as s own by Fig. 8, in which them to slightly grip said caslng d.

Such being the nature and object of our said invention what we claim is-:

1. An explosive cartridge of the character described, consisting of a casing, a detonator therein and a disk of light flexible fibrous material having an aperture for the passage of the wires of the detonator, and a supi orting flange bent at an angle to the dis the end of the casing being bent over-the flange and against the disk.

2. An explosive cartridge of the character described, consisting of a casin a detonator located therein, a disk of light exible fibrous material having an aperture for the passage of the wires of the detonator, and a sup orting. flange bent at an angle to the dis and against the disk, and means for fastening the ends of the casing over the disk.

3. An explosive cartridge of the character described, consisting of a casing, a detonator located therein, and a disk of light flexible fibrous material having a central assage and a radial slot for the passage of t e wlres of the detonator, and a supporting flange bent at an angleto the disk, the end of the casing the ,ends of the casing being bent over the flange being bent over the flange and against the disk.

4. An explosive cartridge of the character described, consistin of a casing, a detonator located therein an a disk of light flexible fibrous material located within said casing, having a central aperture, a radial slot and an opening at its periphery at the end of said slot for the assage of the detonator and its and having a central aperture and radial slot I for the passage of the detonator wires, an opening at the end of said slot for the passage of the detonator, openings for the escape of gas, and casing and bent at an angle to the disk, the

a supporting flange located in the ends of the casing being bent over the flange I and a ainst the disk.

6. ter described, a disk of li ht flexible fibrous material formed with a ange consisting of tapering projections, vents for the esca e of,

as, and a central aperture and radia slot or the passage of the wires of a detonator.

7. An explosive cartridge of the character described, consisting ofa casin a detonator located therein, a disk of light exible fibrous material located in the end of the casing having a central aperture for the assage of detonator wires, and a supporting ange, the ends of the casing being bent over said flange and against the disk, and a cord extending from and secured to the casing and fastening tihekinturned endof the casing against the 1s In testimony whereof we have afiixed our signatures in presence of two witnesses.

Witnesses SAMUEL HEY,

J OHN WHITEHEAD.

11 an explosive cartridge of the charac- 

